lily/spacing-engraver.cc

   1 /*
   2   spacing-engraver.cc --  implement Spacing_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "musical-request.hh"
  11 #include "paper-column.hh"
  12
  13 #include "spacing-spanner.hh"
  14 #include "engraver.hh"
  15 #include "pqueue.hh"
  16
  17 struct Rhythmic_tuple
  18 {
  19   Grob_info info_;
  20   Moment end_;
  21
  22   Rhythmic_tuple ()
  23     {
  24     }
  25   Rhythmic_tuple (Grob_info i, Moment m)
  26     {
  27       info_ = i;
  28       end_ = m;
  29     }
  30   static int time_compare (Rhythmic_tuple const &, Rhythmic_tuple const &);
  31 };
  32
  33 /**
  34    Acknowledge rhythmic elements, for initializing spacing fields in
  35    the columns.
  36
  37    should be the  last one of the toplevel context
  38 */
  39 class Spacing_engraver : public Engraver
  40 {
  41   PQueue<Rhythmic_tuple> playing_durations_;
  42   Array<Rhythmic_tuple> now_durations_;
  43   Array<Rhythmic_tuple> stopped_durations_;
  44
  45   Spanner * spacing_p_;
  46 protected:
  47   VIRTUAL_COPY_CONS (Translator);
  48   virtual void acknowledge_grob (Grob_info);
  49   virtual void start_translation_timestep ();
  50   virtual void stop_translation_timestep ();
  51   virtual void initialize ();
  52   virtual void finalize ();
  53 public:
  54   Spacing_engraver ();
  55 };
  56
  57 inline int
  58 compare (Rhythmic_tuple const &a, Rhythmic_tuple const &b)
  59 {
  60   return Rhythmic_tuple::time_compare (a,b);
  61 }
  62
  63 int
  64 Rhythmic_tuple::time_compare (Rhythmic_tuple const &h1,
  65                               Rhythmic_tuple const &h2)
  66 {
  67   return (h1.end_ - h2.end_).main_part_.sign ();
  68 }
  69
  70 Spacing_engraver::Spacing_engraver ()
  71 {
  72   spacing_p_ = 0;
  73 }
  74
  75 void
  76 Spacing_engraver::initialize ()
  77 {
  78   spacing_p_  =new Spanner (get_property ("SpacingSpanner"));
  79   Spacing_spanner::set_interface (spacing_p_);
  80   spacing_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  81   announce_grob (spacing_p_, 0);
  82 }
  83
  84 void
  85 Spacing_engraver::finalize ()
  86 {
  87   Grob * p = unsmob_grob (get_property ("currentCommandColumn"));
  88   spacing_p_->set_bound (RIGHT, p);
  89   typeset_grob (spacing_p_);
  90   spacing_p_ =0;
  91 }
  92
  93 void
  94 Spacing_engraver::acknowledge_grob (Grob_info i)
  95 {
  96   if (to_boolean (i.elem_l_->get_grob_property ("non-rhythmic")))
  97     return;
  98
  99   if (Rhythmic_req * r = dynamic_cast<Rhythmic_req*> (i.req_l_))
 100     {
 101       Rhythmic_tuple t (i, now_mom () + r->length_mom ());
 102       now_durations_.push (t);
 103     }
 104 }
 105
 106 void
 107 Spacing_engraver::stop_translation_timestep ()
 108 {
 109   Moment shortest_playing;
 110   shortest_playing.set_infinite (1);
 111   for (int i=0; i < playing_durations_.size (); i++)
 112     {
 113       Moment m = (playing_durations_[i].info_.req_l_)->length_mom ();
 114       if (m)
 115         {
 116           shortest_playing = shortest_playing <? m;
 117         }
 118     }
 119
 120   Moment starter, inf;
 121   inf.set_infinite (1);
 122   starter=inf;
 123   for (int i=0; i < now_durations_.size (); i++)
 124     {
 125       Moment m = now_durations_[i].info_.req_l_->length_mom ();
 126       if (m)
 127         starter = starter <? m;
 128
 129       playing_durations_.insert (now_durations_[i]);
 130     }
 131   now_durations_.clear ();
 132
 133   shortest_playing = shortest_playing <? starter;
 134
 135   Paper_column * sc
 136     = dynamic_cast<Paper_column*> (unsmob_grob (get_property ("currentMusicalColumn")));
 137
 138   SCM sh = shortest_playing.smobbed_copy ();
 139   SCM st = starter.smobbed_copy ();
 140
 141   sc->set_grob_property ("shortest-playing-duration", sh);
 142   sc->set_grob_property ("shortest-starter-duration", st);
 143 }
 144
 145 void
 146 Spacing_engraver::start_translation_timestep ()
 147 {
 148   Moment now = now_mom ();
 149   stopped_durations_.clear ();
 150   while (playing_durations_.size () && playing_durations_.front ().end_ < now)
 151     playing_durations_.delmin ();
 152   while (playing_durations_.size () && playing_durations_.front ().end_ == now)
 153     stopped_durations_.push (playing_durations_.get ());
 154 }
 155
 156 ADD_THIS_TRANSLATOR (Spacing_engraver);
 157
 158